Display device with low refractive layer disposed on color conversion layer

Abstract

A display device includes a bank including an opening defining a plurality of pixels; a plurality of light emitting elements disposed in the plurality of pixels; a color conversion layer disposed on the plurality of light emitting elements in the opening; and a low refractive layer disposed on the color conversion layer in the opening.

What is claimed is: 
     
       1. A display device comprising:
 a bank including an opening defining a plurality of pixels, the bank having a topmost surface and side surfaces; 
 a plurality of light emitting elements disposed in the plurality of pixels; 
 a second bank disposed between the bank and the plurality of light emitting elements, a thickness in the vertical direction of the bank being greater than a thickness in the vertical direction of the second bank; 
 a color conversion layer disposed on the plurality of light emitting elements overlapping the opening; and 
 a first layer disposed on the color conversion layer overlapping the opening, the first layer at least partially disposed below the topmost surface of the bank and including a first resin having a refractive index lower than a refractive index of the color conversion layer. 
 
     
     
       2. The display device of  claim 1 , wherein the first layer directly contacts the color conversion layer. 
     
     
       3. The display device of  claim 1 , wherein the first layer includes at least one surface that directly contacts at least one of the bank, a capping layer, or the color conversion layer in the opening. 
     
     
       4. The display device of  claim 1 , wherein
 the first layer includes:
 an edge portion contacting the bank in the opening; and 
 a central portion surrounded by the edge portion, and 
 
 a thickness of the edge portion of the first layer is thicker than a thickness of the central portion of the first layer. 
 
     
     
       5. The display device of  claim 4 , further comprising a capping layer overlapping the first layer. 
     
     
       6. The display device of  claim 5 , wherein
 a surface of the first layer contacts the color conversion layer, and 
 another surface of the first layer contacts the capping layer. 
 
     
     
       7. The display device of  claim 5 , wherein the capping layer is disposed on the bank and directly contacts the bank. 
     
     
       8. The display device of  claim 5 , wherein the capping layer includes at least one of a silicon oxide (SiO x ), a silicon nitride (SiN x ), a silicon oxynitride (SiO x N y ), an aluminum oxide (AlO x ), or a titanium oxide (TiO x ). 
     
     
       9. The display device of  claim 1 , wherein a surface of the bank has liquid repellency. 
     
     
       10. The display device of  claim 1 , further comprising a color filter layer overlapping the color conversion layer,
 wherein the first layer is disposed between the color conversion layer and the color filter layer. 
 
     
     
       11. The display device of  claim 1 , wherein the first layer further includes hollow particles dispersed in the first resin. 
     
     
       12. The display device of  claim 1 , wherein the color conversion layer includes:
 a base resin; and 
 quantum dots dispersed in the base resin. 
 
     
     
       13. A display device comprising:
 a bank including an opening defining a plurality of pixels, the bank having a topmost surface and side surfaces; 
 an inclination pattern disposed on the bank, wherein an inclination angle of the inclination pattern with respect to a substrate is smaller than an inclination angle of the bank with respect to the substrate: 
 a plurality of light emitting elements disposed in the plurality of pixels; 
 a color conversion layer disposed on the plurality of light emitting elements overlapping the opening; 
 a first layer disposed on the color conversion layer overlapping the opening, the first layer at least partially disposed below the topmost surface of the bank; and 
 a capping layer disposed between the color conversion layer and the first layer. 
 
     
     
       14. A display device comprising:
 a bank including an opening defining a plurality of pixels, the bank having a topmost surface and side surfaces; 
 a plurality of light emitting elements disposed in the plurality of pixels; 
 a second bank disposed between the bank and the plurality of light emitting elements, a thickness in the vertical direction of the bank being greater than a thickness in the vertical direction of the second bank; 
 a color conversion layer disposed on the plurality of light emitting elements overlapping the opening; and 
 a first layer disposed on the color conversion layer, the first layer at least partially disposed below the topmost surface of the bank, including a first resin, and having a refractive index lower than a refractive index of the color conversion layer, wherein 
 the first layer overlaps a top surface of the bank. 
 
     
     
       15. The display device of  claim 14 , wherein the first layer is disposed on the color conversion layer and directly contacts the color conversion layer. 
     
     
       16. The display device of  claim 14 , wherein the first layer directly contacts the bank. 
     
     
       17. The display device of  claim 14 , wherein a thickness of the first layer on the color conversion layer is thicker than a thickness of the first layer on the bank. 
     
     
       18. The display device of  claim 14 , further comprising a capping layer overlapping the first layer. 
     
     
       19. The display device of  claim 18 , wherein
 a surface of the first layer contacts the color conversion layer, and 
 another surface of the first layer contacts the capping layer. 
 
     
     
       20. The display device of  claim 1 , wherein
 a refractive index of the first layer is 1.1 to 1.3, and 
 a refractive index of the color conversion layer is 1.6 to 2.0. 
 
     
     
       21. The display device of  claim 1 , wherein an entirety of the first resin is disposed below the topmost surface of the bank. 
     
     
       22. The display device of  claim 1 , wherein the first resin directly contacts at least one side surface of the bank at a location spaced apart from the topmost surface. 
     
     
       23. The display device of  claim 13 , wherein
 a refractive index of the first layer is lower than a refractive index of the color conversion layer, 
 the capping layer is an inorganic layer that directly contacts the color conversion layer, the bank, and the first layer, and 
 at least a portion of the capping layer is disposed below the topmost surface of the bank. 
 
     
     
       24. The display device of  claim 1 , wherein the color conversion layer completely covers the second bank. 
     
     
       25. The display device of  claim 13 , wherein a portion of the first layer overlaps a top surface of the inclination pattern.